As 1684.3 2010 residential timber-framed construction cyclonic areas

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  • 1. AS 1684.3—2010 Residential timber-framed construction (Incorporating Amendment No. 1) Part 3: Cyclonic AreasThis is a free 9 page sample. Access the full version online. AS
  • 2. This Australian Standard® was prepared by Committee TM-002, Timber Framing. It was approved on behalf of the Council of Standards Australia on 21 December 2009. This Standard was published on 21 June 2010. The following are represented on Committee TM-002: • A3P • Association of Consulting Engineers, Australia • Australian Building Codes Board • Australian Institute of Building • Building Research Association of New Zealand • CSIRO Manufacturing and Infrastructures Technology • Engineered Wood Products Association of Australasia • Engineers Australia • Forest Industries Federation (WA) • Frame and Truss Manufacturers Association Australia • Housing Industry Association • Master Builders, Australia • New Zealand Timber Industry FederationThis is a free 9 page sample. Access the full version online. • Scion • South Australian Housing Trust • Timber and Building Materials Association, NSW • Timber Development Association, NSW • Timber Queensland Additional Interests: • Mr Peter Juniper This Standard was issued in draft form for comment as DR AS 1684.3. Standards Australia wishes to acknowledge the participation of the expert individuals that contributed to the development of this Standard through their representation on the Committee and through the public comment period. Keeping Standards up-to-date Australian Standards® are living documents that reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments that may have been published since the Standard was published. Detailed information about Australian Standards, drafts, amendments and new projects can be found by visiting www.standards.org.au Standards Australia welcomes suggestions for improvements, and encourages readers to notify us immediately of any apparent inaccuracies or ambiguities. Contact us via email at mail@standards.org.au, or write to Standards Australia, GPO Box 476, Sydney, NSW 2001.
  • 3. AS 1684.3—2010 (Incorporating Amendment No. 1) Australian Standard®This is a free 9 page sample. Access the full version online. Residential timber-framed construction Part 3: Cyclonic areas First published as AS O56—1946. Second edition 1948. Revised and redesignated as AS CA38—1971. Revised and redesignated as AS 1684—1975. Third edition 1992. Revised and redesignated in part as AS 1684.3—1999. Third edition 2010. Reissued incorporating Amendment No. 1 (June 2012). COPYRIGHT © Standards Australia Limited All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher, unless otherwise permitted under the Copyright Act 1968. Published by SAI Global Limited under licence from Standards Australia Limited, GPO Box 476, Sydney, NSW 2001, Australia ISBN 978 0 7337 9434 6
  • 4. AS 1684.3—2010 2 PREFACE This Standard was prepared by the Joint Standards Australian/Standards New Zealand Committee TM-002, Timber Framing, to supersede AS 1684.3—2006. After consultation with stakeholders in both countries, Standards Australia and Standards New Zealand decided to develop this Standard as an Australian Standard rather than an Australian/New Zealand Standard. This Standard incorporates Amendment No. 1 (June 2012). The changes required by the Amendment are indicated in the text by a marginal bar and amendment number against the clause, note, table, figure or part thereof affected. The objective of this Standard is to provide the building industry with procedures that can be used to determine building practice, to design or check construction details, and to determine member sizes, and bracing and fixing requirements for timber-framed construction in cyclonic areas. The objectives of this revision are to―This is a free 9 page sample. Access the full version online. (a) include editorial amendments and some technical changes to correct mistakes, clarify interpretation and enhance the application of the document; (b) incorporate the outcomes of recent research projects that considered the role and function of wall noggings (Clause 6.2.1.5) and alternative simplified tie-down systems for higher wind areas in particular using ring beam construction methods; (c) include information on generic building practices for EWPs (engineered wood products), which are being widely used in timber-framed construction (see Appendix J); and (d) provide some adjustments to the Span Table values in Supplements for stress grades MGP 10, MGP 12 and MGP 15 in response to changes to the design characteristic values for these stress grades in AS 1720.1. NOTE:These adjustments have been made recognizing that MGP stress grades represent the major product usage in the marketplace. Further work is required to assess and more fully respond to existing and expected changes to the related loading, design, and design criteria Standards, and this may result in a future revision of Span Tables in the Supplements for all stress grades. The increased scope and application of this Standard to cater for these conditions has also led to the need to perform a more rigorous design check on a wider range of members and construction practices including windowsill trimmers and roof bracing. This Standard is a companion publication to the following: AS 1684 Residential timber-framed construction 1684.1 Part 1: Design criteria 1684.2 Part 2: Non-cyclonic areas 1684.4 Part 4: Simplified—Non-cyclonic areas It should also be noted that AS 1684.4 includes additional differences to AS 1684.2 and 1684.3.
  • 5. 3 AS 1684.3—2010 The following Supplements form an integral part of, and must be used in conjunction with, this Standard: Supplement 0 General introduction and index C1 Supp. 1 Wind classification C1—Seasoned softwood—Stress grade F5 C1 Supp. 2 Wind classification C1—Seasoned softwood—Stress grade F7 C1 Supp. 3 Wind classification C1—Seasoned softwood—Stress grade F8 C1 Supp. 4 Wind classification C1—Seasoned softwood—Stress grade MGP 10 C1 Supp. 5 Wind classification C1—Seasoned softwood—Stress grade MGP 12 C1 Supp. 6 Wind classification C1—Seasoned softwood—Stress grade MGP 15 C1 Supp. 7 Wind classification C1—WA seasoned hardwood—Stress grade F14 C1 Supp. 8 Wind classification C1—Seasoned hardwood—Stress grade F17 C1 Supp. 9 Wind classification C1—Seasoned hardwood—Stress grade F27 C1 Supp. 10 Wind classification C1—Unseasoned softwood—Stress grade F5 C1 Supp. 11 Wind classification C1—Unseasoned softwood—Stress grade F7 C1 Supp. 12 Wind classification C1—Unseasoned hardwood—Stress grade F8 C1 Supp. 13 Wind classification C1—Unseasoned hardwood—Stress grade F11 C1 Supp. 14 Wind classification C1—Unseasoned hardwood—Stress grade F14 C1 Supp. 15 Wind classification C1—Unseasoned hardwood—Stress grade F17This is a free 9 page sample. Access the full version online. C2 Supp. 1 Wind classification C2—Seasoned softwood—Stress grade F5 C2 Supp. 2 Wind classification C2—Seasoned softwood—Stress grade F7 C2 Supp. 3 Wind classification C2—Seasoned softwood—Stress grade F8 C2 Supp. 4 Wind classification C2—Seasoned softwood—Stress grade MGP 10 C2 Supp. 5 Wind classification C2—Seasoned softwood—Stress grade MGP 12 C2 Supp. 6 Wind classification C2—Seasoned softwood—Stress grade MGP 15 C2 Supp. 7 Wind classification C2—WA seasoned hardwood—Stress grade F14 C2 Supp. 8 Wind classification C2—Seasoned hardwood—Stress grade F17 C2 Supp. 9 Wind classification C2—Seasoned hardwood—Stress grade F27 C2 Supp. 10 Wind classification C2—Unseasoned softwood—Stress grade F5 C2 Supp. 11 Wind classification C2—Unseasoned softwood—Stress grade F7 C2 Supp. 12 Wind classification C2—Unseasoned hardwood—Stress grade F8 C2 Supp. 13 Wind classification C2—Unseasoned hardwood—Stress grade F11 C2 Supp. 14 Wind classification C2—Unseasoned hardwood—Stress grade F14 C2 Supp. 15 Wind classification C2—Unseasoned hardwood—Stress grade F17 C3 Supp. 1 Wind classification C3—Seasoned softwood—Stress grade F5 C3 Supp. 2 Wind classification C3—Seasoned softwood—Stress grade F7 C3 Supp. 3 Wind classification C3—Seasoned softwood—Stress grade F8 C3 Supp. 4 Wind classification C3—Seasoned softwood—Stress grade MGP 10 C3 Supp. 5 Wind classification C3—Seasoned softwood—Stress grade MGP 12 C3 Supp. 6 Wind classification C3—Seasoned softwood—Stress grade MGP 15 C3 Supp. 7 Wind classification C3—WA seasoned hardwood—Stress grade F14 C3 Supp. 8 Wind classification C3—Seasoned hardwood—Stress grade F17 C3 Supp. 9 Wind classification C3—Seasoned hardwood—Stress grade F27 C3 Supp. 10 Wind classification C3—Unseasoned softwood—Stress grade F5 C3 Supp. 11 Wind classification C3—Unseasoned softwood—Stress grade F7 C3 Supp. 12 Wind classification C3—Unseasoned hardwood—Stress grade F8 C3 Supp. 13 Wind classification C3—Unseasoned hardwood—Stress grade F11 C3 Supp. 14 Wind classification C3—Unseasoned hardwood—Stress grade F14 C3 Supp. 15 Wind classification C3—Unseasoned hardwood—Stress grade F17 Span tables in Supplements for unseasoned hardwood F8 and F11 may be used for unseasoned F8 and F11 softwood as well. A CD-ROM, which contains the above Supplements, is attached to this Standard.
  • 6. AS 1684.3—2010 4 This Standard does not preclude the use of framing, fastening or bracing methods or materials other than those specified. Alternatives may be used, provided they satisfy the requirements of the Building Code of Australia. Statements expressed in mandatory terms in Notes to tables and figures are deemed to be requirements of this Standard. Notes to the text contain information and guidance. They are not an integral part of the Standard. Statements expressed in mandatory terms in Notes to the Span Tables are deemed to be requirements of this Standard. The terms ‘normative’ and ‘informative’ have been used in this Standard to define the application of the appendix to which they apply. A ‘normative’ appendix is an integral part of a Standard, whereas an ‘informative’ appendix is only for information and guidance.This is a free 9 page sample. Access the full version online.
  • 7. 5 AS 1684.3—2010 CONTENTS Page SECTION 1 SCOPE AND GENERAL 1.1 SCOPE AND APPLICATION ..................................................................................... 7 1.2 COMPANION DOCUMENTS .................................................................................... 7 1.3 NORMATIVE REFERENCES .................................................................................... 8 1.4 LIMITATIONS ............................................................................................................ 9 1.5 DESIGN CRITERIA.................................................................................................. 12 1.6 FORCES ON BUILDINGS........................................................................................ 12 1.7 LOAD PATHS—OFFSETS AND CANTILEVERS .................................................. 13 1.8 DURABILITY ........................................................................................................... 14 1.9 DIMENSIONS ........................................................................................................... 15 1.10 BEARING ................................................................................................................. 15 1.11 STRESS GRADES .................................................................................................... 15 1.12 ENGINEERED TIMBER PRODUCTS ANDThis is a free 9 page sample. Access the full version online. ENGINEERED WOOD PRODUCTS (EWPs) ........................................................... 16 1.13 SIZE TOLERANCES ................................................................................................ 16 1.14 ALTERNATIVE TIMBER DIMENSIONS ............................................................... 17 1.15 STEEL GRADE AND CORROSION PROTECTION ............................................... 17 1.16 CONSIDERATIONS FOR DESIGN USING THIS STANDARD ............................. 18 1.17 INTERPOLATION .................................................................................................... 18 SECTION 2 TERMINOLOGY AND DEFINITIONS 2.1 GENERAL ................................................................................................................. 19 2.2 TERMINOLOGY OF FRAMING MEMBERS .......................................................... 19 2.3 VERTICAL LAMINATION ...................................................................................... 22 2.4 STUD LAMINATION ............................................................................................... 24 2.5 HORIZONTAL NAIL LAMINATION—WALL PLATES ONLY ............................ 24 2.6 LOAD WIDTH AND AREA SUPPORTED .............................................................. 25 2.7 DEFINITIONS—GENERAL ..................................................................................... 30 SECTION 3 SUBSTRUCTURE 3.1 GENERAL ................................................................................................................. 34 3.2 SITE PREPARATION AND DRAINAGE ................................................................ 34 3.3 GROUND CLEARANCE AND SUBFLOOR VENTILATION ................................ 34 3.4 DURABILITY ........................................................................................................... 34 3.5 SUBSTRUCTURE BRACING .................................................................................. 34 3.6 SUBFLOOR SUPPORTS .......................................................................................... 34 SECTION 4 FLOOR FRAMING 4.1 GENERAL ................................................................................................................. 38 4.2 BUILDING PRACTICE ............................................................................................ 39 4.3 MEMBER SIZES....................................................................................................... 43
  • 8. AS 1684.3—2010 6 SECTION 5 FLOORING AND DECKING 5.1 GENERAL ................................................................................................................. 50 5.2 PLATFORM FLOORS .............................................................................................. 50 5.3 FITTED FLOORS (CUT-IN FLOORS) ..................................................................... 50 5.4 EXPANSION JOINTS ............................................................................................... 50 5.5 LAYING AND FIXING ............................................................................................ 50 5.6 WET AREA FLOORS ............................................................................................... 53 5.7 JOIST SPACING—FLOORING................................................................................ 53 5.8 DECKING ................................................................................................................. 55 SECTION 6 WALL FRAMING 6.1 GENERAL ................................................................................................................. 56 6.2 BUILDING PRACTICE ............................................................................................ 57 6.3 MEMBER SIZES....................................................................................................... 65 SECTION 7 ROOF FRAMING 7.1 GENERAL ................................................................................................................. 79 7.2 BUILDING PRACTICE ............................................................................................ 80This is a free 9 page sample. Access the full version online. 7.3 MEMBER SIZES....................................................................................................... 95 SECTION 8 RACKING AND SHEAR FORCES (BRACING) 8.1 GENERAL ............................................................................................................... 110 8.2 TEMPORARY BRACING ...................................................................................... 111 8.3 WALL AND SUBFLOOR BRACING..................................................................... 111 SECTION 9 FIXINGS AND TIE-DOWN DESIGN 9.1 GENERAL ............................................................................................................... 161 9.2 GENERAL CONNECTION REQUIREMENTS...................................................... 162 9.3 PROCEDURE FLOW CHART ................................................................................ 165 9.4 NOMINAL AND SPECIFIC FIXING REQUIREMENTS ...................................... 166 9.5 NOMINAL FIXINGS (MINIMUM FIXINGS) ........................................................ 167 9.6 SPECIFIC TIE-DOWN FIXINGS ........................................................................... 168 9.7 SHEAR FORCES .................................................................................................... 210 APPENDICES A TYPICAL CONSTRUCTION MASS ...................................................................... 219 B DURABILITY ......................................................................................................... 222 C INTERPOLATION .................................................................................................. 226 D EXAMPLES—FOUNDATION BEARING AREA AND EVEN DISTRIBUTION OF BRACING ........................................................................................................ 227 E MOISTURE CONTENT AND SHRINKAGE ......................................................... 230 F RACKING FORCES⎯ALTERNATIVE PROCEDURE ......................................... 233 G TIMBER SPECIES AND PROPERTIES ................................................................. 243 H STORAGE AND HANDLING ................................................................................ 254 I COLLAR TIES WITH MULTIPLE ROWS OF UNDERPURLINS ........................ 255 J BUILDING PRACTICES FOR ENGINEERED WOOD PRODUCTS (EWPs)....... 256 BIBLIOGRAPHY .............................................................................................................. 269
  • 9. 7 AS 1684.3—2010 STANDARDS AUSTRALIA Australian Standard Residential timber-framed construction Part 3: Cyclonic areas S E C T I O N 1 S C O P E A N D G E N E R A L 1.1 SCOPE AND APPLICATION 1.1.1 Scope This Standard specifies requirements for building practice and the selection, placement and fixing of the various structural elements used in the construction of timber-framed Class 1 and Class 10 buildings as defined by the Building Code of Australia and within theThis is a free 9 page sample. Access the full version online. limitations given in Clause 1.4. The provisions of this Standard also apply to alterations and additions to such buildings. This Standard also provides building practice and procedures that assist in the correct specification and determination of timber members, bracing and connections, thereby minimizing the risk of creating an environment that may adversely affect the ultimate performance of the structure. This Standard may also be applicable to the design and construction of other classes of buildings where the design criteria, loadings and other parameters applicable to those classes of building are within the limitations of this Standard. NOTES: 1 See AS 1684.1 for details of design criteria, loadings and other parameters. 2 Whilst this Standard may be used to design Class 10 buildings, less conservative levels of design for this building class may be permitted by building regulations and other Australian Standards. 3 Advisory information for the construction and specifications of timber stairs, handrails and balustrades is provided in the FWPA’s publication (see the Bibliography). 1.1.2 Application Throughout this Standard, reference is made to the Span Tables in the Supplements. The Supplements are an integral part of, and shall be used in conjunction with, this Standard. 1.2 COMPANION DOCUMENTS This Standard is a companion publication to the following: AS 1684 Residential timber-framed construction 1684.1 Part 1: Design criteria 1684.2 Part 2: Non-cyclonic areas 1684.4 Part 4: Simplified—Non-cyclonic areas www.standards.org.au © Standards Australia
  • 10. This is a free preview. Purchase the entire publication at the link below: AS 1684.3-2010 Residential timber-framed construction - Cyclonic areasThis is a free 9 page sample. Access the full version online. Looking for additional Standards? Visit SAI Global Infostore Subscribe to our Free Newsletters about Australian Standards® in Legislation; ISO, IEC, BSI and more Do you need to Manage Standards Collections Online? Learn about LexConnect, All Jurisdictions, Standards referenced in Australian legislation Do you want to know when a Standard has changed? Want to become an SAI Global Standards Sales Affiliate? Learn about other SAI Global Services: LOGICOM Military Parts and Supplier Database Metals Infobase Database of Metal Grades, Standards and Manufacturers Materials Infobase Database of Materials, Standards and Suppliers Database of European Law, CELEX and Court Decisions Need to speak with a Customer Service Representative - Contact Us